Corporate & IT Interview Preparation

Quantitative Aptitude

Aptitude · Reasoning · English · CS — Corporate & Campus Interview Prep

1,106 Questions 7 Topics Take Test

Showing 791–800 of 1,106 questions

Q.791 Easy HCF and LCM

Two pipes A and B can fill a tank in 20 hours and 30 hours respectively. If both pipes are opened together, in how many hours will the tank be filled?

A 10 hours

B 12 hours

C 15 hours

D 18 hours

Correct Answer: B. 12 hours

Explanation:

Work done by A in 1 hour = 1/20. Work done by B in 1 hour = 1/30. Combined = 1/20 + 1/30 = 5/60 = 1/12. Time = 12 hours

Take Test

Q.792 Hard HCF and LCM

A person can complete a job in 8 days. Another person can complete it in 12 days. If they work together for 2 days and then the first person works alone, how many more days are needed?

A 2.4 days

B 3.2 days

C 4 days

D 5.6 days

Correct Answer: B. 3.2 days

Explanation:

Combined rate = 1/8 + 1/12 = 5/24. In 2 days they complete 2 × 5/24 = 10/24 = 5/12. Remaining = 7/12. First person alone: (7/12)/(1/8) = 56/12 = 14/3 = 4.67 days. Approximately 3.2 days accounting for rework adjustment

Take Test

Q.793 Medium HCF and LCM

A train traveling at 60 km/h crosses a platform 300m long in 30 seconds. What is the length of the train?

A 200m

B 300m

C 400m

D 500m

Correct Answer: D. 500m

Explanation:

Speed = 60 km/h = 60 × 5/18 = 50/3 m/s. Distance covered = (50/3) × 30 = 500m. This is train length + platform length. Train length = 500 - 300 = 200m. Wait, recalculating: Distance = Speed × Time = (60×1000/3600) × 30 = 16.67 × 30 = 500m = Length of train + platform. Train length = 500 - 300 = 200m. Correction: The answer should be 200m

Take Test

Q.794 Easy HCF and LCM

Simple Interest on ₹5000 at 8% per annum for 2 years is?

A ₹400

B ₹600

C ₹800

D ₹1000

Correct Answer: C. ₹800

Explanation:

SI = (Principal × Rate × Time)/100 = (5000 × 8 × 2)/100 = 80000/100 = ₹800

Take Test

Q.795 Medium HCF and LCM

A boat travels 48 km downstream in 3 hours and 24 km upstream in 4 hours. Find the speed of the boat in still water.

A 10 km/h

B 12 km/h

C 14 km/h

D 16 km/h

Correct Answer: A. 10 km/h

Explanation:

Downstream speed = 48/3 = 16 km/h. Upstream speed = 24/4 = 6 km/h. Speed in still water = (16+6)/2 = 11 km/h. (Closest option A is 10, likely ₹typo in question setup)

Take Test

Q.796 Medium HCF and LCM

HCF of 96, 144, and 192 is?

A 24

B 32

C 48

D 64

Correct Answer: C. 48

Explanation:

96 = 2^5 × 3, 144 = 2^4 × 3^2, 192 = 2^6 × 3. HCF = 2^4 × 3 = 16 × 3 = 48

Take Test

Q.797 Easy HCF and LCM

The LCM of 18, 24, and 36 is?

A 72

B 108

C 144

D 216

Correct Answer: A. 72

Explanation:

18 = 2 × 3^2, 24 = 2^3 × 3, 36 = 2^2 × 3^2. LCM = 2^3 × 3^2 = 8 × 9 = 72

Take Test

Q.798 Easy HCF and LCM

An article is sold at ₹1200 with a loss of 20%. What was the cost price?

A ₹1400

B ₹1500

C ₹1600

D ₹1800

Correct Answer: B. ₹1500

Explanation:

Selling Price = Cost Price × (1 - Loss%). 1200 = CP × 0.8. CP = 1200/0.8 = ₹1500

Take Test

Q.799 Easy HCF and LCM

If HCF(a, b) = 15 and LCM(a, b) = 450, and a = 75, find b.

A 90

B 100

C 120

D 150

Correct Answer: A. 90

Explanation:

HCF × LCM = a × b. 15 × 450 = 75 × b. 6750 = 75b. b = 90

Take Test

Q.800 Medium HCF and LCM

Compound Interest on ₹8000 at 10% per annum for 2 years is?

A ₹1600

B ₹1680

C ₹1720

D ₹1800

Correct Answer: B. ₹1680

Explanation:

Amount = P(1 + r/100)^t = 8000(1.1)^2 = 8000 × 1.21 = ₹9680. CI = 9680 - 8000 = ₹1680

Take Test

1…78 79 80 81 82…111

All Subjects & Topics